Emile sieeet



2 Sheets-Sheet 1.

Model.)

- E. SIRRET.

WEIGHING SCALE.

4'70. Patented Apr. 8, 1884.

(ModeL) 2 Sheets-Sheet 2.

E. SIRRET.

WEIGHING SGALE, v No. 296,470. Patented Apr. 8, 1884.

Nrrnn TATES Arena Orrrcn,

EMILE SIRRET, OF BUFFALO, NEXV YORK.

WElGHING-SCALE.

SPECIFICATION forming part of Letters Patent No. 296A70, dated April 8, 1884-,

Application filed December 18, 1883.

To aZZ whom. it may concern.-

Be 1t known that I, EMILE SIRRET, a citizen of the United States, residing at Buffalo,

in the county of Erie and State of New York, have invented a new and useful \Veighing- Scale, of which the following is a specification.

This invention relates to certain new and use ful improvements in weighing-scales, having special reference to that class known as pendulum-scales.

It has for its objects, first, to provide a scale whose indicating-hand shall accurately register the quantity weighed upon a dial or graduated plate whose division-marks are equidistant; second,to provide a scale of this character which shall be capable of minute adjustments, whereby any variation incident to changes of the temperature may be corrected; third, to provide a scale whose supportingplatform shall not exert any weight upon the supporting points of the pendulum shaft;

fourth, to provide a pendulum whose weights shall be independent and relatively eccentrically supported; and, fifth, to provide a pendulum whose weights shall be independent and relatively eccentrically supported, and whose arm or stem shall be provided with a pea capable of radial and circumferential adjustment.

In the accompanying drawings forming a part of this specification, and on which the same letters of reference indicate corresponding features, Figure 1 represents a side elevation of my improved scale; Fig. 2, a detached perspective view of the pendulum, its supporting-shaft, and the indica'tinghand; Fig. 3, a side elevation of aportion of the beam, showing in section an adj ustable collar fitted thereon; Fig. 4, a plan view of the same portion of the beam, showing the adj Listing-collar in horizontal section; and Fig. 5, a detached perspective view of a portion of the beam and the platform-standard.

The letter Adesignates the frame of my improved scale, the same consisting of the approximately upright portions 13, (only one of which is shown,) and the horizontal part B, from which project at each end the legs B This frame is constructed of cast-iron, preferably, and to the upper portion of it is piv- (Model) otally connected the guiding-arm 0, the free end of which is bifurcated to receive the standard 0, this connection being made by means of a pin, 0 This pin may be constructed with a knife-edge, if desired, and the opening in the standard through which it passes may be formed accordingly. The lower end of this standard is provided with a knife-edged cross head, D, whose outer ends are shouldered to prevent lateral displacement, and the upper end with the platform D.

Mounted on a knifeedge, D, which extends transversely to the base-piece B, and which is cast or otherwise secured thereto, is the beam D One end of this beam is provided with a cross-head,from which extend the arms E, the lower edges of which are notched at D" to fit over the knife-edge D, and the upper edges near the ends are also notched, so as to receive the cross-head D of the standard 0. By this means, it will be observed, the standard O is free to moveup and down, and yet it maintains a vertical position, this latter result being due to the approximate equality of the distance between the pivotal points of the arm 0 and the pin 0 and the distance between the notches D in the arms E, and the contact of the cross-head with the said arm.

A transverse pendulum-shaft, E, is delicately mounted in the upper part of the frame A on points or studs Extending through this shaft transversely is a short arm, F, a setscrew, F, being provided so as to fix its radius. One end of the said arm terminates in a bifurcation, which receives a link, F to which it is pivotally connected. The lower end of this link is also pivotally connected by means of a pin, G with an adjustable collar, G, which fits over and is adapted to slide on the long arm of the beam D". The beam at the part which is occupied by this collar may, if desired, be reduced in size, and the collar may be constructed in any approved manner. In the present instance it consists of two jaws united at one end and providednear the other with connecting-bolts G, whereby the said jaws may be delicately adjusted against the points of the pin G so as to take up any lost motion incident to wear at this point. The collar is further provided with a set screw, II, which serves to fix its position on the beam.

The letter 11 designates the pendulum rod or stem, the upper end of which is adjustably connected with the pendulunrshaft E, a setscrew, H being in this instance employed to hold the same in any fixed position, though any other means for this purpose may be adopted. A collar, 1', is loosely fitted on this stem, and is provided with an adjusting weight or pen, I, having a threaded extension, 1

which screws into the collar Lwhereby its po-' sition is fixed on the stem. This weight or pea,itwill thus be observed, is capable ofradial adjustment relatively with the pivotal points of the pendulum-shaftthat is, it isadjustable up and down on said shalt-and is also adjustable circumferentially, whereby its influonce over thenormal position of the stem H is regulated. The lower end of this stem is provided with a disk forming a weight, J, this disk being rigidly connected with it. livotally connected with said disk, at a point eccentric to the pivotal. points or center of oscillation of the pemluli'nn-shalt, is a second disk or weight, J, a stop, J being attached to the disk J, and embracing the pivoted disk to limit the swing of the latter in one direction when the pendulumstem is moved out of normal position.

The let-tor K. designates theindicatinghand, the same being secured to the pendulum-shalt ll, and extended radially therefrom until it reaches the graduated scale marked on the plate K.

It will be observed that the pound-marks are all at equal distances apart, and that the marks which indicate fractions of pounds between each of the pound-marks are also relatively at equal distances apart. This resultis attained by the use of the weight J, pivoted eccentrically to the pivotal points of the pendulmn-shait, and 1 have found by actual experiment that if the peildulum-weightis not so pivotally arranged the imlicatinghand will not travel the same relative. distance before reaching the division marked 3 and alter reaching the division marked 5 by the iu-.

crease of additional weight on the platl'or1nthat is to say, the indicatinghand, when caused by a given amount of weight to reach a certain division on the dial-plate less than the division marked 3 or more than the division marked 5, will not move to the next division by an additional amount of weight equal to that designated by the said next divisionmark. This dillieulty is completelyovercome by the pivoted weight of the pendulum, as above described.

A weight, K", having a set-screw, K, is fitted on the beam I), so as to l'acilitate in elfooting the adjustment of the scale to make the hand normally stand at zero. Another weight or pea, K (indicated in dotted lines in Fig. 1,) may be resorted to and applied to the end of the beam II) when it is desired to weigh bodies heavier than would be registered by the graduated scale, this weight being equal to one, two, or three pounds, or more,

as the case may be, according to the weight placed on the platform.

After the parts of the scale are manufactured and put together, the indicatinghand is to be set so as to stand normally at zero. This is approximately done by adjusting the arm 1? in the pendulum-shal't E, and the collar G and weight K on the beam D. To bring the hand accurately over the mark zero, the adjust-able pea or weight I is resorted to, and it will be observed from Fig. 1 that the more this weight is adjusted circumferentially, so as to come more nearly in the same vertical plane as the disk J of the pond ulum, the farther the pendulum stem will depart from the perpendicular. Therefore, if the angle between the hand and the pendulum-stem is not just right, so as to bring the hand over zero normally, it can be brought there by the adjustment of the weight 1.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In ascale, the combination, with the indicating hand and a graduated plate having indicatingmarks, of a pendulum having a weight supported eccentrically to the pivotal points of the penduluin-support.

2. In a scale, the combination, with an indicating-hand, a pendulum, and a shaft upon which the hand and the pendulum are mounted, the pendulum being provided with a weight supported eccentrically to the axis of said shaft, of a graduated scale having equidistant indieatingmarks.

3. In. a scale, the combination, with the pendulum ,ofa supplemental weight connected thereto eccentrically to the point of oscillation of the pendulum.

In a scale, the combination, with. the pendulum having a supplemental weight connected thereto eccentrically to the point of oscillation of the pendulum, and. a stop to limit the movement of the said supplemental weight, of a pea connected to the pendulum and capable ol' adj ustmcnt radially from the point of oscillation and cireumlerentially around the pendulum-stem.

In a scale, the combination, with the supporting-platform and the pivoted guide, of the pivoted beam, the pemlulum-shalt, the means for connecting the beam and the shaft, the shaft being provided with an indicatinghand, and a pendulumhaving a supplemental weight supported eccentrically to the point of oscillation of said shalt.

6. In a scale, the combination, with the supporting-platlorm, the standard, and the pivoted guide-arm, of the pivoted beam having an adjustable collar, the pemlulum-shaft provided with an adjustable arm, and the link connecting the arm and the collar together.

7. In a scale, the combination,with. the supporting-platform, the standard, and the pivlum shaft having an adjustable arm, the oted guide-arm, of the pivoted beam, the disbeam and shaft being adj ustably connected totanee between the pivotal points of the arm gethcr.

and its connection With the standard being EMILE SIRRET. 5 approximately the same as the distance be- Vitnesses:

tween the pivotal point of the beam and its BERNARD KENNEY,

contact with said standard, and the pendw JAMEs M. OLoAK. 

